Machining casting, also known as large castings, bed frames, bases, and worktables, features: ⑴ Low wear and good shock absorption. ⑵ Good processability. Due to the high carbon content in gray cast iron, which is close to eutectic composition, the melting point is relatively low, with good fluidity, low shrinkage rate, making it suitable for casting complex structures or thin-walled castings. Additionally, since graphite facilitates the formation of chip breakage during cutting, the machinability of gray cast iron is superior to that of steel.